QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

123 km NNE of Suárez, Puerto Rico

Yes. A magnitude 2.7 earthquake was recorded 123 km NNE of Suárez, Puerto Rico, at 11:05 am AST on 4 July 2019 (15:05 UTC), 46 km deep.

· 46 km deep · released about 360 lb of TNT

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Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.7 (md)
Depth
46 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 125 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2603 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.5 on 2018-03-06 — about 470 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 122 km NNE of Vieques, Puerto Rico · 31 km ESE of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 32 km SSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 19.5151, -65.5903. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 125 km (77 mi) SSW earthquakes near Loíza Municipio
Cataño Municipio, PR 133 km (82 mi) SSW earthquakes near Cataño Municipio
Toa Baja Municipio, PR 134 km (83 mi) SSW earthquakes near Toa Baja Municipio
Dorado Municipio, PR 136 km (84 mi) SSW earthquakes near Dorado Municipio
Vega Baja Municipio, PR 145 km (90 mi) SW earthquakes near Vega Baja Municipio
Manatí Municipio, PR 152 km (95 mi) SW earthquakes near Manatí Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

27 earthquakes have been recorded within 50 km since this one.

  1. 3.3 126 km N of San Juan, Puerto Rico
  2. 3.3 135 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.4 135 km N of San Juan, Puerto Rico
  4. 3.4 Puerto Rico region
  5. 3.2 130 km NNE of Vieques, Puerto Rico
  6. 2.1 81 km NNE of Suárez, Puerto Rico
  7. 2.8 84 km NNE of Vieques, Puerto Rico
  8. 3.1 95 km NNE of Luquillo, Puerto Rico
  9. 2.6 104 km N of Suárez, Puerto Rico
  10. 2.9 86 km NNE of Vieques, Puerto Rico
  11. 2.8 80 km NNE of Vieques, Puerto Rico
  12. 2.4 81 km NNE of Vieques, Puerto Rico
  13. 2.9 117 km NNE of Vieques, Puerto Rico
  14. 2.2 80 km NNE of Vieques, Puerto Rico
  15. 3.1 109 km NNE of Vieques, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.